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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2021
Equity |
Summary of Changes in Accumulated Other Comprehensive Loss by Component | Changes in accumulated other comprehensive loss by component for the six months ended June 30, 2021 and 2020 consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Other-Than- | ​ | ​ | ​ | ​ | ​
​ | ​ | Minimum | ​ | Temporary | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension | ​ | Impairment of | ​ | Interest Rate | ​ | ​ | ​
​ |  | Liability |  | Investment |  | Derivatives |  | Total
Balance, December 31, 2020 | ​ | $ | (26,623) | ​ | $ | (3,509) | ​ | $ | (27,819) | ​ | $ | (57,951)
Gains arising during period | ​ | ​ | 8,324 | ​ | ​ | — | ​ | ​ | 176 | ​ | ​ | 8,500
Amounts reclassified from accumulated other comprehensive loss | ​ | ​ | 588 | ​ |  | 105 | ​ |  | 8,111 | ​ |  | 8,804
Net other comprehensive income | ​ |  | 8,912 | ​ |  | 105 | ​ |  | 8,287 | ​ |  | 17,304
Balance, June 30, 2021 | ​ | $ | (17,711) | ​ | $ | (3,404) | ​ | $ | (19,532) | ​ | $ | (40,647)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Other-Than- | ​ | ​ | ​ | ​ | ​
​ | ​ | Minimum | ​ | Temporary | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension | ​ | Impairment of | ​ | Interest Rate | ​ | ​ | ​
​ |  | Liability |  | Investment |  | Derivatives |  | Total
Balance, December 31, 2019 | ​ | $ | (23,916) | ​ | $ | (5,877) | ​ | $ | 1,634 | ​ | $ | (28,159)
Losses arising during period | ​ | ​ | (1,106) | ​ | ​ | — | ​ | ​ | (40,148) | ​ | ​ | (41,254)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 33 | ​ |  | 105 | ​ |  | 2,490 | ​ |  | 2,628
Net other comprehensive income (loss) | ​ |  | (1,073) | ​ |  | 105 | ​ |  | (37,658) | ​ |  | (38,626)
Transition adjustment related to adoption of ASU 2016-13 | ​ | ​ | — | ​ | ​ | 2,158 | ​ | ​ | — | ​ | ​ | 2,158
Balance, June 30, 2020 | ​ | $ | (24,989) | ​ | $ | (3,614) | ​ | $ | (36,024) | ​ | $ | (64,627)

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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